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The door switch doesn't go to the dome lights , the switch (door ajar switch ) is an input to the SMJ - smart junction box or body control module take your pick . Principles of Operation
When the SJB detects a request for lighting, it turns on the interior lamps by supplying power to the lamps. The request for lighting can be an open door signal from a door ajar switch, an interior lighting on command from the instrument panel dimmer switch or an unlock command from a remote keyless entry (RKE) transmitter.
The door ajar switches are hard-wired directly to the SJB. The 2 door ajar switches are normally closed when the doors are closed. The decklid ajar switch is normally closed when the decklid is closed. All door ajar switches receive voltage from the SJB and each has its own ground circuit.
The instrument panel dimmer switch receives a ground signal from the SJB. The instrument panel dimmer switch provides variable resistance for backlighting the instrument cluster and a toggle ON/OFF function for the interior lights.
The RKE receiver is contained inside the SJB. When the SJB receives an unlock request from an RKE transmitter, it unlocks the doors and turns on the interior lamps. There could be DTC'S diagnostic trouble codes stored in the SJB ! You can not access these codes with a OBD2 code reader , need a factory scan tool .
B1319
Driver Door Ajar Circuit Failure
Go To Pinpoint Test D .
B1327
Passenger Door Ajar Circuit Failure
Go To Pinpoint Test D .
B2021
Dome Lamp Input Return Circuit Failure
Go To Pinpoint Test A .
B2550
Dome Lamp Output Circuit Short to Ground
Go To Pinpoint Test A .
B2554
Dome Lamp Output Circuit Failure
Go To Pinpoint Test D .
Do you know B-codes -body control .
Your best bet is to take to a ASE certified repair facility or a Ford dealer .

Pits one of the five door ajar switches. They are located in the door latch mechanism that holds the door closed. The best way to figure out which one it is is to scan the body control module. With all the doors closed. It will tell you which door is giving the open signal. This will need to be done with a high end scan tool that any good shop or the dealer will have.
The most common one to fail is the driver front door.

Try spraying wd40 into each door latch. Do it one at a time then open and close the door about a dozen times spray some more in there after about 6 open and closes. Do this with each door and even the hatch. This should clear ya right up.

I had this problem on my 2003 explorer and took WD40 and gave the lock mechanism a good dose where it meets the clasp on the door jam. Then open and close the doors a couple of times to get them working. They get gummed up and sometimes have a tendency to stick.